The TS‎-772 is a Delegate unit for TOA Conference system‎,‎ of which compact and lightweight design makes it easy to install and store‎.‎ Placing the speech button in the ON position permits speech and disables the speaker to prevent feedback‎.‎ If the speech button is placed in the OFF position‎,‎ the microphone cannot be used but the speaker is turned on‎,‎ allowing the voices from other conference units to be monitored‎.‎ Two types of dedicated microphones are made available for the TS‎-772 as optional products‎:‎ the TS‎-773 standard type and the TS‎-774 long type‎.‎